How does the width of a Dna double helix vary?

Question by thesav1or: How does the width of a Dna double helix vary?
Why and Where does the width of the dna double helix change? what causes the variation in width?
thanks.

Best answer:

Answer by Asst Prof
If there is a variation in width, it’s an error. Normally one pyrimidine (C, U, or T) will pair up with one purine (A or G). The purine-pyrimidine pair has a constant width. If two pyrimidines paired-up, the helix width would be smaller; if two purines paired-up, the width would be greater. However, this doesn’t normally happen, since the base-pairing is determined by hydrogen bonding characteristics.

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